Is it possible, that with the correct technologies, to theoretically create an artificial sun?

For an actual Sun: Linguists may argue their is only one Sun... All the others are stars.

To create a star, all you need is to collect matter containing light elements (Hydrogen, etc.) that can fuse to form heavier elements You will need mainly elements lighter than iron..

To make one that is realistic, you will need at least 60 times the mass of Jupiter - and when you collect it together it should make a small brown dwarf.

It is possible to model such conditions on a smaller scale on Earth.

The first intentional fusion reaction was the hydrogen bomb tested in 1952.

Experiments continue to generate fusion reactions for power. The reactions can be started OK, but current technology uses more power to start and contain the reaction than is generated.

Two ways to answer....

First, they've been working on controlled fusion for almost 40 years. (And, we've been "30 years away" almost the whole time...) They would like to simulate the heat and pressure needed to sustain fusion, which would give us a clean, nearly unlimited energy source... This is something like an 'artificial sun'.

Second, an *actual* sun requires mass. Lots of mass. Like, 80 times the mass of Jupiter - which is lots and lots of mass... That mass (should we be able to get it, and control it) would draw itself together through it's own gravity; at some point, the core of this mass would heat and reach the threshold for fusion - and, (since we built it) it would be something like an 'artificial sun'.

No.

To start, the sun has about a million times as much mass as the earth. It is mostly hydrogen and helium. Finding and collecting that much hydrogen is far beyond our current capabilities.

Can we make something that gives off enough infra-red to warm you like the sun? Yes. It's called a heat lamp, and it keeps your cheeseburger warm before you buy it.

Can we make lamps that put out a full spectrum of visible light plus UV, just like the sun? Yes. You can buy them at the hardware store.

Can we create a fusion reaction with hydrogen, as the sun does? Yes, but it requires some very special equipment.

Can we create a hydrogen fusion reaction that feeds itself like the sun does does? No.

There was an interesting comparison of our solar system that I wish I really remembered. I believe that one part of it was that our Earth was a ping pong ball or so, and the sun was a 100 foot disk a mile away. That's how big the sun is, or near enough to understand what you ask.

If you mean a COMPLETELY hypothetical situation, then, yes, one could create a sun.

That assumes an enormous amount of hydrogen, enough to equal millions of times the mass of earth.

It assumes the ability to gather that mass of hydrogen in one place and control its accretion into a sun sized sphere.

The <<only >> control you would have is the amount of hydrogen used in the creation stage. It would be impossible to control anything after that. Once nuclear fusion begins, any person with a few tens of millions of miles would be dead, and any craft would be totally burned back to atoms.

The phrase "with the correct technologies" demands an answer of "yes". Otherwise, they weren't the correct technologies.

No - not on the scale of a star - there is no way for us to collect and move the vast amounts of Hydrogen needed.

we've already created such fusion reactions, but they only last for a short period of time. they're called hydrogen bombs.